.yby-popover-box{
    position: relative;
}
.yby-popover-box .yby-popover-dialog{
    display: none;
    position: absolute;
    width: 320px;
    height: 223px;
    bottom: calc(100% + 5px);
    border: 1px solid #d0d6d9;
    box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.1);
    background-color: #ffffff;
    z-index: 5;
    border-radius: 4px;
}
.yby-popover-box .yby-popover-dialog .popover-close{
    position: absolute;
    top: 8px;
    right: 8px;
    width: 16px;
    height: 16px;
    line-height: 11px;
    text-align: center;
    background-color: #ffffff;
    color: #999999;
    border-radius: 50%;
    border: 1px solid #999999;
    display: inline-block;
    cursor: pointer;
}